Ground warp shifting means for terry looms

ABSTRACT

A terry loom, of the type in which the fell of the cloth being woven is shifted forwardly and rearwardly during terry weaving relative to the beat-up point of the reed, is provided with means for shifting a ground warp tension-sensing whip roll forwardly and rearwardly in unison with like motion of the cloth without adversely affecting the normal function of the whip roll in controlling a letoff mechanism for the ground warps, thus obviating the need for an additional or separate roll or bar for shifting the ground warps incident to terry weaving.

United States Patent GROUND WARP SHIFTlNG MEANS FOR TERRY LOOMS 4Claims, 4 Drawing Figs.

U.S. Cl. 139/25, 139/ l 10 Int. Cl D03d 39/22 Field of Search t l 39/109, 110, 114, ll5,24, 25, 26

[56] References Cited UNITED STATES PATENTS 1,737,688 12/1929 Ryon3,130,756 4/1964 Moberg 3,351,096 11/1967 Burgess et a1 PrimaryExaminer-Henry S. Jaudon v Attorney-Parrott, Bell, Seltzer, Park &Gibson ABSTRACT: A terry loom, of the type in which the fell of thecloth being woven is shifted forwardly and rearwardly during terryweaving relative to the beat-up point of the reed, is provided withmeans for shifting a ground warp tension-sensing whip roll forwardly andrearwardly in unison with like motion of the cloth without adverselyaffecting the normal function of the whip roll in controlling a letoffmechanism for the ground warps, thus obviating theneed for an additionalor separate roll or bar for shifting the ground warps incident to terryweav- 2 Sheets-Sheet 1 mvzmons: BOUGLAS P Buraqa-ss ATTORNEYS PatentedMarch 16,, 15971 2 Sheets-Sheet 2 INVENTORSI if lLMER vi/10:

KP Bu aqess ILUAMS:

GROUND WARP SIIIFI'ING MEANS FOR TERRY LOOMS This invention isparticularly concerned with improvements in that type of terry loom inwhich the cloth and ground warps are shifted forwardly and rearwardly,in alternation, to change the position of the fell of the cloth relativeto the beat-up point of the reed in affecting the beat-up of loose picksand fast picks of filling in the formation of terry pile loops. In someof the looms the cloth is shifted forwardly and permitted to be pulledrearwardly, in alternation, by means of an oscillatable cloth shiftingroll or bar spaced above the cloth take up roll and carried by pivotedlevers operated by a terry cam, as disclosed, for example, in BlanchardsU.S. Pat. No. 1,739,205 dated Dec. 10, 1929. In others of such terrylooms, the cloth take up roll is oscillated about its own axis byconnections with a terry cam so as to shift the cloth forwardly andrearwardly in alternation, as disclosed in the U.S. Pat. of Burgess etal. No. 3,351,096, dated Nov. 7, I967, for example.

In order to ensure effective control of the tension-in the cloth andground warps in a terry loom, many terry looms now in general use areprovided with positive ground warp letoff mechanism of the type in whichthe rate of letoff of the ground warps is controlled in response tovariations in ground warp tension being sensed by a whip roll biasedagainst the ground warps, and operatively connected to the letoffmechanism. l-Ieretofore, in order to shift the ground warps rearwardlyto return the fell of the cloth to the beat-up position of the reedconcurrent with each rearward motion of the cloth-shifting roll or thecloth takeup roll, as the case may be, and to permit the ground warps tobeshifted forwardly without materially affecting the tension thereinduring each forward motion of the cloth effected by the cloth-shiftingroll or the cloth takeup roll, an oscillatable ground warp engaging andshifting roll or bar, operated by the terry cam, has been required inaddition to the whip roll. Such ground warp shifting roll along with itssupporting and operating structure, not only increases the cost ofconstruction and maintenance of a terry loom, but it presents anobstruction which interferes with exchanging the warp beams,manipulation of the ground and terry warps, and the performance of othercorrective work by the weaver or loom fixer. Also, in someinstallations, the whip roll had to be positioned rearwardly of itsnormal position to accommodate the additional warp-shifting roll, sothat the operator had to reach that much further to install andmanipulate the usual stop motion drop wires and to insert broken yarnsin the heddles, etc.

It is therefore an object of this invention to provide means whereby theshifting of the ground warps in a terry loom is effected by the samewhip roll which controls the ground warp letoff mechanism, thusobviating the need for a separate ground warp shifting roll or bar inaddition to the warp roll.

It is a more specific object of the invention to provide meansoperatively connected to the whip roll of a terry loom for shifting thewhip toll roll in opposite directions, in alteration, in a planeangularly disposed with respect to that plane of motion of the whip rollincident to performance of its function of sensing the tension in theground warps and controlling the letoff mechanism, and wherein theextent and the plane of shifting movements of the whip roll are such asto permit the ground warps to move forwardly and to move the groundwarps rearwardly relative to the reed and the terry warps substantiallythe same amounts as and at the same time as the cloth is being moved byits respective shifting means.

Some of the objects of the invention having been stated, other objectswill appear as the description proceeds when taken in connection withthe accompanying drawings, in which:

FIG. 1 is a fragmentary side elevation of the rear portion of a terryloom showing a preferred embodiment of the improved ground warp shiftingmeans of the instant invention is association with a positive groundwarp letoff mechanism;

FIG. 2 is a fragmentary rear elevation of the loom, with portions brokenaway, looking substantially along line 2-2 of FIG. 1.

FIG. 3 is a schematic longitudinal vertical sectional view through theloom particularly illustrating mechanical connections between the whiproll shifting mechanism, the cloth shifting mechanism and a terry cam;and

FIG. 4 is an enlarged fragmentary plan view of the cloth shifting meansshown in the right-hand portion of FIG. 3, as embodied in means forshifting the cloth take up roll forwardly and rearwardly in alternation.

Referring more specifically to the'drawings, the present invention isshown in FIG. 1 in association with the positive, variable-speed groundwarp letoff mechanism 10 of a terry loom. The terry loom may be of theshuttleless type, such as a Draper DSL, a Sulzer," a MAV" loom or thelike, or it may be of the well-known fly-shuttle type. In other words,the loom may be conventional to the extent that it comprises a frameincluding a left-hand and right-hand side frame members ll, 11' whoserear portions rotatably support a ground warp beam 13 from whichtensioned ground warps W pass upwardly in engagement with and over aletoff tension sensing member or whip roll 14. Although whip roll 14performs its usual function of sensing variations in tension in theground warps W and controlling the ground warp letoff mechanism 10 inresponse thereto, the supporting means and operating means for the whiproll 14 are peculiar to the instant invention as will be laterdescribed. 1

Above the whip roll, terry pile warps T extend downwardly from asuitable source, such as a terry warp beam, not shown, and then passpartially around and beneath a terry warp guide roll 15. From the whiproll 14 and terry warp guide roll 15, the ground warp W and terry warpsT extend forwardly through suitable stop motion drop wires 20 (FIG. 3),shed forming means or heddles 21, and an oscillatable reed 22. Theforward ends of the warps T, W are connected to the fell of the cloth Cat the beat-up point of a reed 22. The cloth is advanced during weavingover a conventional cloth takeup roll 23 and then extends downwardly tobe rolled up on a suitable cloth roll 24, as is conventional.

Any suitable means may be provided for shifting the cloth C forwardly tomove the fell thereof forwardly of the beat-up point of reed 22 andthereby to facilitate a beat-up of loose picks of filling in the warpshed, and for permitting the cloth C to be pulled back, at least at thefell thereof, to return the fell to the normal beat-up point of reed 22to facilitate the beating up of fast picks of filling incident to theformation of terry loops. By way of example, the cloth shifting means isshown as being of the type disclosed in said Burgess et al. U.S. Pat.Nor.

3,351,096, dated Nov. 7, I967, in which the cloth takeup roll 23 isoscillated independently of and during normal operation of theconventional cloth take up mechanism for imparting forward and rearwardmotion to the cloth engaging the cloth take up roll 23.

As shown, themeans for oscillating cloth takeup roll 23 comprises atakeup roll rocking device broadly designated at 25 shown in the form ofa planetary gear system or differential gear unit including first andsecond or outer and inner sun bevel gears 31, 32 (FIGS. 3 and 4) looselymounted on the shaft 23a of takeup roll 23'. Sun gear 31 serves as anoscillatable member for positively oscillating or rocking takeup roll 23without transmitting rotary motion to inner sun gear 32, and gear 32serves as a' rotary member for rotating takeup roll 23 and effectingnormal increments of take up motion of the cloth without transmittingrotary motion to outer sun gear 31. A cloth roll gear 34 is fixed to orformed integral with the hub of second sun bevel gear 32, and cloth rollgear 34 is driven by and constitutes an element of a conventional takeup mechanism, other elements of which are not shown in the presentdrawings, but are clearly shown and described in said U.S. Pat. No.3,351,096. A pair of diametrically opposed planetary bevel gears 35(FIG. 4) is disposed between and positioned in intermeshing relationwith both sun gears 31, 32. Planetary gears 35 are journaled on oppositeends of a block 36 keyed or otherwise secured on cloth roll shaft 23a.

A crank arm 37 on first sun gear 31 has the front end of a link 40 (FIG.3) pivotally connected thereto, the rear end of which is pivotallyconnected to a lever 41 pivotally mounted on the loom frame, as at 42(FIG. 3). Lever 41 also has one end of a link 43 pivotally connectedthereto and extending rearwardly to the lower end of a cam follower arm44 having a follower 45 mounted thereon which engages the periphery of adriven terry cam 46. Preferably, the loom is provided with two of suchterry cams, two follower arms and two followers adjacent opposite sidesof the loom for purposes to be later described. Each follower arm 44extends upwardly and is pivotally mounted, as at 47, on the frame of theloom. The upper portion of each follower arm 44 has a spring 50connected thereto which serves to normally urge each follower 45 againstthe respective cam.

Other details and the operation of the takeup roll rocking device 25 arefully disclosed in said U.S. Pat. No. 3,351,096 and, accordingly, afurther detailed description thereof is deemed unnecessary, it beingdeemed sufficient to state that,

each time the low surface of each terry cam 46 moves into engagementwith the respective follower 45, the spring 50 adjacent rocking device25 is effective, through intervening connections, to impartpredetermined clockwise movement to first sun gear 31 (FIG. 3) andthereby impart corresponding angular motion to cloth take up roll 23 toadvance the cloth about three-sixteenths to one-fourth of an inch ormore (equal to about 7-10 or more picks of filling), depending upon thedesired length of terry loops to be formed. Conversely, whenever thehigh surface of the corresponding cam 46 moves into engagement withfollower 45, rearward angular motion is imparted to cloth take up roll23 to return the fell of the cloth C to the beat-up point of reed 22 asthe ground warps W are pulled rearwardly by whip roll 14 in a manner tobe later described.

The ground warp letoff mechanism is a form of variablespeed unit and isshown in FIG. 1 as being of a type known as a Hunt Posi-Tension Let-Off,which is similar to that disclosed in Hunts U.S. Pat. No. 2,786,491,issued March 26, 1957. The ground warp letoff mechanism may take otherforms and, for example, may be of a type such as is disclosed inPfarrwallers US. Pat. No. 2,951,509, issued Sept. 6, 1960.

As shown in FIG. 1, letoff mechanism 10 comprises a frame 55 in whichinput and output, or upper and lower, shafts 57 and 56 are joumaled andon which respective expansible or variable-speed pulleys 60, 61 aremounted. Input shafts 56 is operatively connected to a constantly drivenloom shaft 62 by suitable sprocket wheels 63,64 and an endless sprocketchain 65. The expansible pulleys 60, 61 are interconnected by an endlessbelt 66. Output shaft 57 is connected, by suitable gearing, not shown,in a gear box 67, to a pinion 70 which engages a large gear 71 on thecorresponding end of warp beams 13 (FIG. 2).

Upper and lower pivot shafts 72, 73 joumaled in the frame 55 adjacentthe pulleys 60, 61 (FIG. 1) have respective finger levers 74, 75 fixedlymounted thereon and engaging corresponding axially movable flanges ofthe respective pulleys 60, 61 proximal portions of finger levers 74, 75being interconnected by a link 76. Lower fingers lever 75 has a weightarm 77 integral therewith and projecting rearwardly therefrom and fromwhich a suitable weight member or members 80 are suspended. The lowerpivot shaft 73 has a hub 81 fixed thereon to which the lower end of acable 82 is clampingly secured.

I-Ieretofore, the whip roll 14 has been mounted on arms secured to ashaft which a corresponding end of a lever was secured and the latterlever was connected to the upper end of the cable 82 so that thedownward force applied to the cable by the weight member 80substantially balanced the weight of the whip roll 14 and the pressureof ground warps W thereagainst. If the pressure of the ground warps W onthe whip roll was increased, the weight member would be moved upwardly,allowing the belt 66 to move upwardly in the pulleys 60, 61 and therebycausing warping beam 13 to move slightly faster. Conversely, if thepressure of the ground warps W on the whip roll 14 was decreased, theweight member would move downwardly and the opposite action would occur.

The function of the whip roll 14 in controlling the output speed of thevariable-speed letoff mechanism 10 in conjunction with the instantinvention is essentially the same as that described above. However,according to the instant invention, whip roll 14 has the additionalfunction of shifting the ground warps by permitting them to moveforwardly with the cloth C whenever the cloth is advanced in theaforementioned manner to move the fell of the cloth a predetermineddistance forwardly of the beat-up point of the reed, and to retract ormove the ground warps W rearwardly as the cloth is permitted to moverearwardly to return the fell of the cloth to the beat-up position. Asis well known, during terry weaving, the fell of the cloth usuallyoccupies a position forwardly of the beat-up point during two out ofthree picks of the loom in which loose picks of filling are inserted inthe warp shed and beaten up to the beat-up point in spaced relation tothe fell of the cloth being woven. Also, the fell of the cloth occupiessubstantially the same position as the beat-up point of the reed, duringeach third pick of the loom, in which a fast pick of filling is insertedin the warp shed and then beaten up against the fell of the cloth, thuspushing the now slackened terry warps T up to the fell and forming pileloops therefrom.

The whip roll of conventional loom is usually supported upon or joumaledin a pair of support arms fixedly secured on opposite ends of atransverse pivot shaft 86 mounted on the loom side frame members ll, 11above warp beam 13. According to the instant invention, however, thewhip roll is mounted for movement in opposite directions, inalternation, in a plane angularly disposed with respect to that plane ofmotion of the whip roll in performing its function of sensing thetension in the ground warps and controlling the letoff mechanism.Therefore, reduced opposite ends of whip roll 14 are joumaled in bearingblocks 87 (FIG. 2) carried by medial portions of respective whip rollshifting levers on carrier arms 90. As shown, the axis of whip roll 14is disposed on substantially the same horizontal plane as the pivotshaft 86, and each whip roll shifting lever 90 extends downwardly asubstantial distance below the axis of whip roll 14 and is pivotallyconnected, as at 91, to a plate member or bar 92 suitably secured to orformed integral with a corresponding support arm 86 fixed on shaft 86.

Each whip roll shifting lever 90 also extends upwardly a substantialdistance above the axis of whip roll 14 and has a longitudinallyextending adjustment slot 94 therethrough for reception of an adjustableshoulder screw 95 on which the rear end of a corresponding link 96 ispivotally mounted. Although a single terry cam 46 is shown in FIG. 3, asheretofore stated, it is preferred that a similar terry cam is providedadjacent the opposite side of the loom, along with correspondingfollower 45 and follower arm 44 so that the links 96 extend forwardlyfrom the respective whip roll shifting lever 90 and may be pivotallyconnected to respective follower anns 44 below the pivot points 47thereof.

A bracket 100 is suitably secured to the forward portion of one of saidsupport anns 85, or it may be secured directly on pivot shaft 86,adjacent the letolf mechanism 10. The upper portion of bracket 100 hasthe rear portion of a control arm 101 suitably secured thereto, to theforward portion of which the upper end of cable 82 is connected.Although the terry warp guide roll 15 is shown positioned between upperportions of the whip roll shifting levers 90 in FIG. 2, guide roll 15 isnot carried by levers 90, but may be supported by conventional or othermeans, not shown.

METHOD OF OPERATION In operation, it will be noted that the downwardforce of weight applied to weight lever 77 by weight member 80 appliesan upward force to whip roll 14, because the hub 81 and cable 82 apply adownward force to control arm 101 tending to rotate the same, along withthe bracket 100 and arms 85 on the pivot shaft 86 to which both supportarms 85 are secured. In so doing, the support arms yieldably urge theplate members 92, the whip roll shifting levers 90, the bearing blocks87, and whip roll 14 upwardly in a first'plane generally perpendicularwith respect to the ground ground warps W engaged thereby. Thus, whiproll 14 senses variations in the tension of the ground warps W. It isapparent that whip roll 14 controls the output speed of the ground warpletoff mechanism 10, since any upward movement of whip roll 14 isreflected in downward movement of weight. member 80 and any downwardmovement of whip roll 14 is reflected in upward movement of weightmember 80.

During the weaving of terry cloth, whenever the high surfaces of terrycams 46 move into engagement with followers 45 and impart correspondingclockwise motion to follower arms 44, it can be appreciated that thisnot only returns the cloth C to its normal position, but also impartsrearward movement to links 96, whip roll shifting levers 90, and thewhip roll 14, causing whip roll 14 to pull the ground warps W rearwardlya predetermined distance to aid in returning the fell of the cloth C tothe beat-up position of reed 22. Conversely, whenever the low surfacesof cams 46 move into engagement with the followers 45 (FIG. 3) followerarms 44 move into a counterclockwise direction (FIG. 3) to impartforward motion to the cloth C and at the same time, whip roll 14 ismoved forwardly by means of the whip roll shifting levers 90 and thelinks 96 connecting the same to follower arms 44.

it is apparent the amount of angular motion imparted to cloth takeuproll 23 in each instance is the same or substantially the same as theamount of forward and rearward motion imparted to whip roll 14 so thatthe tension in the ground warps W remains substantially constant. Thus,even through whip roll 14 is moved forwardly and rearwardly in theweaving of terry cloth, this does not interfere with the function ofwhip roll 14 in controlling the operation of the ground warp letoffmechaniam 10. In other words, the amount of forward and rearwardmovement imparted to whip roll 14 by terry cams 46 is so small as tohave no adverse affect on the control of the ground warp positive letoffmechaniam by whip roll 14.

It is thus seen that we have provided supporting and operating means forthe whip roll 14 which permits the whip roll to form a bight in theground warps W and to move in a first plane generally perpendicular withrespect to the ground warps W engaged thereby in accordance withvariations in the tension of the ground warps and we have also providedmeans operatively connected to the whip roll for shifting the same inopposite directions in alternation in a second plane angularly disposedrelative to the first plane substantially in unison with respect toforward and rearward movement of the cloth as effected by the clothtakeup roll rocking device 25,-and wherein the extent and plane of theshifting movement movements of the whip roll are such that as to movethe ground warps forwardly and rearwardly substantially the same amountsas the cloth is moved by the cloth-shifting means embodied in the clothtakeup roll rocking device 25.

In the drawings and specification there has been set forth a preferredembodiment of the invention, and although specific terms are employed,they are used in a generic and descriptive sense only and not forpurposes of limitation.

We claim:

1. In a terry loom of the type having means for shifting cloth beingwoven forwardly and rearwardly in alternation relative to the beat-uppoint of a reed in the weaving of terry cloth from terry warps andground warps, control means including a whip roll for controlling thetension in the ground warps with the whip roll engaging and forming abight in the ground warps, and wherein the whip roll moves in a firstplane generally perpendicular with respect to the ground warps engagedthereby to sense variations in the tension of the ground warps; thecombination therewith of means operatively connected to said whip rollfor shifting the same in opposite directions in alternation in a secondplane angularly di s sed relative to said first plane substantially inunison wit the 'and rearwardly substantially the same amounts as thecloth is moved by said cloth shifting means.

2. A structure according to claim 1, wherein said loom includes a warpbeam supplying said ground warps, said control means also including adriven variable speed letofi' mechanism driving said beam, a pair ofwhip roll support arms supporting said whip roll and being operativelyconnected to said mechanism for controlling the same and normally biasedin said first plane and urging said whip roll against the ground warpsby said mechanism, said'means operatively connected to said whip rollincluding carrier arms pivotally supported by the respective whip rollsupport arms, bearing means carried by said carrier arms and in whichopposite ends of the whip toll are rotatably mounted, and meansoperatively connected to said carrier arms for pivoting the same in saidopposite directions in said second plane in alternation and atpredetermined intervals.

3. A structure accordingto claim 1, wherein said loom includes a warpbeam spaced beneath said whip roll and from which the ground warps passupwardly over the whip roll and then extend forwardly in a substantiallyhorizontal plane constituting said second plane, said control meansfurther comprising a pair of support arms pivotally mounted to the loomadjacent opposite ends of said whip roll and normally biased upwardly,said means operatively connected to said whip roll comprising a pair ofcarrier arms supporting opposite ends of said whip roll and having lowerportions pivotally supported by said support arms on axesspaced belowthe level of the pivotal axes of said support arms, rotary cam meansdriven by the loom, follower means engaging said cam means, and meansoperatively connecting said follower means to said carrier arms forshifting the same in said opposite directions in said second planerelative to said support arms.

4. A structure according to claim 1, wherein said means operativelyconnected to said whip roll comprises a transverse shaft rotatablysupported by the loom, a pair of support arms fixed on and extendingrearwardly from said shaft adjacent opposite sides of the loom, a pairof carrier arms pivotally sup ported by said support arms for movementin said second plane about respective substantially horizontal pivotalaxes spaced below and rearwardly of the axis of said shaft, meansrotatably mounting opposite ends of said whip roll on said carrier armsadjacent and rearwardly of said shaft; rotary terry cam meansoperatively connected to said carrier arms for moving the same forwardlyand rearwardly in alternation to impart like movement to said whip rollat predetermined intervals, said loom having a warp beam from which saidground warps extend to and over said whip roll, and said control meansfurther comprising a variable speed ground warp letoff mechanismdrivingly connected to said warp beam and including a weighted arm forvarying the output of speed of said letoff mechanism in response tomovement of said weighted arm, a control arm fixed with respect to saidshaft and with respect to said support arms, and means connecting saidcontrol arm to said weighted arm such that the weighted arm yieldablyurges said whip roll in said first plane and against the ground warpswhereby the position of said weighted arm and consequent speed of saidwarp beam are varied in accordance with variations in the tension ofsaid ground warps sensed by said whip roll irrespective of changes inthe position of said whip roll in said second plane.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 570,547 Dated March 16, 1971 Inventor(s) Douglas P. Burgess and Gilmer A.Williams It is certified that error appears in the above-identifiedpatent and that said Letters Patent are hereby corrected as shown below:

In the Abstract, line 7, "letof should be -1etoff; Column 1, line "the"(first occurence) should be --such-, lines and 14, "take up" should betake-up-, lines 29 and 32, "takeup" should be -takeuplines 20, 21, 25,51, 59 and 72, "letoff" should be let-off, line 21 "mechanism" should be"mechanismsline 55, omit "toll", line "alteration" should bealterna.tion-, line 73, after "FIG. 2" insert (Sheet 2), line 74, "of"should be in-; Column 2, line 5, after FIG. 4" insert (Sheet 1), lines11, 20 and 23, "letofi should be --letoff, line 17, omit "a", line 31,"warp" should be -warps, line 36, omit "a", lines 37, 49, 54, 55, 59,and 62, "takeup" shoul be takeup--; lines 7, 51, 64 and 68, "cake up"should be take-up Column 3, line 15, after "cam" insert 46-, line 16,"takeup" shoui be -take-up, lines 26 and 32, "take up" should betake-up, lines 36, 40 and 43, "letoff" should be -let-off-, line 44,"57" shou be 56-, line 45, "56" should be -57--, line 46, "shafts"should be shaft, line 52, "beams" should be -beam-, line 60, "fingers"should be -finger-, line 67, after "shaft" insert -to-, line 73, after"member" insert line 75, "warping" should be "warp-- Column 4, lines 5,36 and 61, "letoff" should be --let-off, line 27, after "of" insert-a--, line 39, "on" should be or-, line 45, "86" should be line 54,after "with" insert -a--; Column 5, line 7 "of" should be in-, line 24,omit "the", line 25, "into" should be lines 30, 52 and 57, "takeup"should be -takeup-, line 33, "throug should be -thoughlines 9, 37 and41, "letoff" should be "let-offline 51, "movement" should be movements,line 53, omit "mover Column 6, lines 13, 57 and 60, "letoff" should beletoff, line 22 "coll' should be roll, line 31, "to" should be on-, line59, om IIOfH- Signed and sealed this 21st. day of September 1971.

(SEAL) Attest:

ROBERT GO'ITSCHALK :ZDWARD T'LFLETCHER, JR.

Acting Commissioner of Pat Attesting Officer

1. In a terry loom of the type having means for shifting cloth being woven forwardly and rearwardly in alternation relative to the beat-up point of a reed in the weaving of terry cloth from terry warps and ground warps, control means including a whip roll for controlling the tension in the ground warps with the whip roll engaging and forming a bight in the ground warps, and wherein the whip roll moves in a first plane generally perpendicular with respect to the ground warps engaged thereby to sense variations in the tension of the ground warps; the combination therewith of means operatively connected to said whip roll for shifting the same in opposite directions in alternation in a second plane angularly disposed relative to said first plane substantially in unison with the respective forward and rearward movements of the cloth, and wherein the extent and plane of such shifting movements of said whip roll are such as to move the ground warps forwardly and rearwardly substantially the same amounts as the cloth is moved by said cloth shifting means.
 2. A structure according to claim 1, wherein said loom includes a warp beam supplying said ground warps, said control means also including a driven variable speed letoff mechanism driving said beam, a pair of whip roll support arms supporting said whip roll and being operatively connected to said mechanism for controlling the same and normally biased in said first plane and urging said whip roll against the ground warps by said mechanism, said means operatively connected to said whip roll including carrier arms pivotally supported by the respective whip roll support arms, bearing means carried by said carrier arms and in which opposite ends of the whip toll are rotatably mounted, and means operatively connected to said carrier arms for pivoting the same in said opposite directions in said second plane in alternation and at predetermined intervals.
 3. A structure according to claim 1, wherein said loom includes a warp beam spaced beneath said whip roll and from which the ground warps pass upwardly over the whip roll and then extend forwardly in a substantially horizontal plane constituting said second plane, said control means further comprising a pair of support arms pivotally mounted to the loom adjacent opposite ends of said whip roll and normally biased upwardly, said means operatively connected to said whip roll comprising a pair of carrier arms supporting opposite ends of said whip roll and having lower portions pivotally supported by said support arms on axes spaced below the level of the pivotal axes of said support arms, rotary cam means driven by the loom, follower means engaging said cam means, and means operatively connecting said follower means to said carrier arms for shifting the same in said opposite directions in said second plane relative to said support arms.
 4. A structure according to claim 1, wherein said means operatively connected to said whip roll comprises a transverse shaft rotatably supported by the loom, a pair of support arms fixed on and extending rearwardly from said shaft adjacent opposite sides of the loom, a pair of carrier arms pivotally supported by said support arms for movement in said second plane about respective substantially horizontal pivotal axes spaced below and rearwardly of the axis of said shaft, means rotatably mounting opposite ends of said whip roll on said carrier arms adjacent and rearwardly of said shaft, rotary terry cam means operatively connected to said carrier arms for moving the same forwardly and rearwardly in alternation to impart like movement to said whip roll at predetermined intervals, said loom having a warp beam from which said ground warps extend to and over said whip roll, and said control means further comprising a variable speed ground warp letoff mechanism drivingly connected to said warp beam and including a weighted arm for varying the output of speed of said letoff mechanism in response to movement of said weighted arm, a control arm fixed with respect to said shaft and with respect to said support arms, and means connecting said control arm to said weighted arm such that the weighted arm yieldably urges said whip roll in said first plane and against the ground warps whereby the position of said weighted arm and consequent speed of said warp beam are varied in accordance with variations in the tension of said ground warps sensed by said whip roll irrespective of changes in the position of said whip roll in said second plane. 